A magnetically permeable material comprising a substantially amorphous permalloy film is disclosed. The substantially amorphous permalloy film is formed by ion-beam sputtering. The substantially amorphous permalloy film exhibits improved output amplitude and noise characteristics....http://www.google.com.au/patents/US6416880?utm_source=gb-gplus-sharePatent US6416880 - Amorphous permalloy films and method of preparing the same
